drivers/mmc/core/quirks.c

   1 /*
   2  *  This file contains work-arounds for many known sdio hardware
   3  *  bugs.
   4  *
   5  *  Copyright (c) 2011 Pierre Tardy <tardyp@gmail.com>
   6  *  Inspired from pci fixup code:
   7  *  Copyright (c) 1999 Martin Mares <mj@ucw.cz>
   8  *
   9  */
  10
  11 #include <linux/types.h>
  12 #include <linux/kernel.h>
  13 #include <linux/mmc/card.h>
  14 #include <linux/mod_devicetable.h>
  15
  16 /*
  17  *  The world is not perfect and supplies us with broken mmc/sdio devices.
  18  *  For at least a part of these bugs we need a work-around
  19  */
  20
  21 struct mmc_fixup {
  22         u16 vendor, device;     /* You can use SDIO_ANY_ID here of course */
  23         void (*vendor_fixup)(struct mmc_card *card, int data);
  24         int data;
  25 };
  26
  27 /*
  28  * This hook just adds a quirk unconditionnally
  29  */
  30 static void __maybe_unused add_quirk(struct mmc_card *card, int data)
  31 {
  32         card->quirks |= data;
  33 }
  34
  35 /*
  36  * This hook just removes a quirk unconditionnally
  37  */
  38 static void __maybe_unused remove_quirk(struct mmc_card *card, int data)
  39 {
  40         card->quirks &= ~data;
  41 }
  42
  43 /*
  44  * This hook just adds a quirk for all sdio devices
  45  */
  46 static void add_quirk_for_sdio_devices(struct mmc_card *card, int data)
  47 {
  48         if (mmc_card_sdio(card))
  49                 card->quirks |= data;
  50 }
  51
  52 #ifndef SDIO_VENDOR_ID_TI
  53 #define SDIO_VENDOR_ID_TI               0x0097
  54 #endif
  55
  56 #ifndef SDIO_DEVICE_ID_TI_WL1271
  57 #define SDIO_DEVICE_ID_TI_WL1271        0x4076
  58 #endif
  59
  60 static const struct mmc_fixup mmc_fixup_methods[] = {
  61         /* by default sdio devices are considered CLK_GATING broken */
  62         /* good cards will be whitelisted as they are tested */
  63         { SDIO_ANY_ID, SDIO_ANY_ID,
  64                 add_quirk_for_sdio_devices, MMC_QUIRK_BROKEN_CLK_GATING },
  65         { SDIO_VENDOR_ID_TI, SDIO_DEVICE_ID_TI_WL1271,
  66                 remove_quirk, MMC_QUIRK_BROKEN_CLK_GATING },
  67         { 0 }
  68 };
  69
  70 void mmc_fixup_device(struct mmc_card *card)
  71 {
  72         const struct mmc_fixup *f;
  73
  74         for (f = mmc_fixup_methods; f->vendor_fixup; f++) {
  75                 if ((f->vendor == card->cis.vendor
  76                      || f->vendor == (u16) SDIO_ANY_ID) &&
  77                     (f->device == card->cis.device
  78                      || f->device == (u16) SDIO_ANY_ID)) {
  79                         dev_dbg(&card->dev, "calling %pF\n", f->vendor_fixup);
  80                         f->vendor_fixup(card, f->data);
  81                 }
  82         }
  83 }
  84 EXPORT_SYMBOL(mmc_fixup_device);